Energy Coordination Control Strategy of Distributed Energy Storage System of Optical Storage DC Microgrid based on Improved Droop Control

Aiming at the problems of frequent charging and discharging, slow speed and poor accuracy of state of charge(SOC) equalization in the distributed energy storage system with optical storage DC microgrid for oil and gas mining equipment, a DC microgrid energy coordination control strategy based on improved droop control is proposed in this paper. The strategy improves the overall power supply quality of the microgrid system by optimizing the micro source output priority: when the photovoltaic and energy storage work at the same time, the working state of them and the droop coefficient of the energy storage unit are dynamically adjusted to meet the needs of the system. In the microgrid system with different capacity energy storage units, this strategy can maintain the stability of bus voltage and improve the equalization speed and accuracy of energy storage SOC, while avoiding the shutdown of energy storage units due to overcharge/discharge. The system simulation model is built in Simulink, and the simulation results show the effectiveness of the control strategy.